Specifications

EMC-CS-2009.1
© Copyright Ford Motor Company – All Rights Reserved Page 101 of 121
February 11, 2010
When the external circuit is predominately capacitive, the transient produced (Pulse A2-2) is significantly different than
Pulse A2-1. When the switch contacts open, a damped sinusoidal transient (f
res
~ 2kHz) is produced. When the switch
contacts bounce during closure a higher frequency, damped sinusoidal transient (f
res
~180kHz) is produced. During this
phase, there is a corresponding current transient with a magnitude approximately 30 A
P-P
(see Figure D-4c). When attempting
to measure Pulse A2-2, on an oscilloscope, it is recommended to trigger on the transient current.
Figure D-2: CI 220 Pulse A1 Composite Waveform
-300
-250
-200
-150
-100
-50
0
50
-2-10123
msec
Volts
Figure D-3: CI 220 Pulse A2-1 Pulse Characteristics
-500
-400
-300
-200
-100
0
100
200
300
-50 0 50 100 150 200 250 300 350
usec
Volts
See Detail
a) Contact Break and Bounce
-400
-300
-200
-100
0
100
200
300
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
usec
Volts
b) Contact Break and Bounce (Detail)